Verilog | Instantiating a varied parameter

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You left out the most important part. The [NUMBER OF 1'S CALCULATED] is where the problem is. Please post that.

Keep in mind that parameter values must be known at compile time. You can do calculations with them, but any inputs must be constants or other parameters. They cannot be variables, registers, wires etc. Verilog isn't like software languages. The hardware is created when the FPGA image is built and in general cannot be changed at runtime.

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Hi Galfonz,

Thank you for your reply.

What do you mean by "You can do calculations with them"?

I saw that in System Verilog, one can use something which is called 'Parameter Type' - can it do what I want?

Here's my code for calculating number of 1's in an input data:

`resetall

`timescale 1ns/10ps

`define cct 10

module ones_counter

// port declarations

(input wire aclr_n,

input wire clk,

input wire [15:0] data,

input wire sync_n,

input wire fin_read,

output reg [2:0] ones_num

);

// internal declarations

wire equ;

reg [7:0] data_shift;

reg [2:0] ones_cnt;

// local declarations

// internal signal declarations

/* ---------------------------------------------------------------------------

****************** counting number of ones in a vector ***********************

--------------------------------------------------------------------------- */

always @ (posedge clk, negedge aclr_n)

begin

if (!aclr_n)

data_shift <= 8'b0;

else

if (sync_n)

data_shift <= data[13:6];

else

data_shift <= data_shift << 1;

end

assign equ = (data_shift[7] ^ 1'b0) & (!sync_n);

always @ (posedge clk, negedge aclr_n)

begin

if (!aclr_n)

ones_cnt <= 3'b0;

else

if (equ && data[15])

ones_cnt <= ones_cnt + 1'b1;

else

if (fin_read)

ones_cnt <= 3'b0;

end

always @ (posedge clk, aclr_n)

begin

if (!aclr_n)

ones_num <= 3'b0;

else

if (data_shift[7:0] == 8'b0)

ones_num <= ones_cnt;

else

ones_num <= 3'b0;

end

endmodule

ones_num register holds the final result at the end, and I wish to instantiate this value to my main code.

- Refael.